# Maffs vs Derivative Master by ChatStick

The clearest difference is in-app purchases: Maffs at none against Derivative Master by ChatStick's 1. Maffs also leads on ads (none vs shown) and iOS requirement (15.1 vs 26.2). On price and device support there is nothing between them.

Both are free to download. Derivative Master by ChatStick sells 1 one-off in-app purchase. Maffs asks for nothing beyond the download.

## The numbers

| Metric | Maffs | Derivative Master by ChatStick |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Size | 29 MB | 10 MB |
| Requires iOS | **15.1** | 26.2 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Prospre Nutrition Inc.](https://appshunter.io/developer/1464400656) | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) |

## What reviewers say

### Maffs

[App page](https://appshunter.io/ios/app/maffs-calculus-practice/id6759699583)

**Features:** macOS Compatibility

**In-app purchases:** none


### Derivative Master by ChatStick

[App page](https://appshunter.io/ios/app/derivative-master-by-chatstick/id6770905531)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Features | $2.99 | one-time |


## Frequently asked questions

### Is Maffs free?

Maffs is free to download, with no in-app purchases.

### Is Derivative Master by ChatStick free?

Derivative Master by ChatStick is free to download, with in-app purchases available.

### Do Maffs or Derivative Master by ChatStick have ads?

Derivative Master by ChatStick shows ads; Maffs does not.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*